NO, the AC adapter we sell should only be used with 110~120V powerline voltage. If your powerline voltage is 240V, you must use a step down converter to convert the powerline voltage down to 110V. Alternatively, you can purchase a 24VAC adapter locally in Australia, which will meet the powerline standard. If you already have an existing sprinkler controller and it has a 24VAC transformer, you can reuse it.